In what way has the developement of cellular phones been characteristic of the modern era

I will answer the question in the image.

C. I an IV

Explanation:

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."